| Haemataulics |
Study of movement of blood through blood vessels |
| Hagiology |
Study of saints |
| Halieutics |
Study of fishing |
| Hamartiology |
Study of sin |
| Harmonics |
Study of musical acoustics |
| Hedonics |
Part of ethics or psychology dealing with pleasure |
| Helcology |
Study of ulcers |
| Heliology |
Science of the sun |
| Helioseismology |
Study of sun's interior by observing its surface oscillations |
| Helminthology |
Study of worms |
| Hematology |
Study of blood |
| Heortology |
Study of religious feasts |
| Hepatology |
Study of liver |
| Heraldry |
Study of coats of arms |
| Heresiology |
Study of heresies |
| Herpetology |
Study of reptiles and amphibians |
| Hierology |
Science of sacred matters |
| Hippiatrics |
Study of diseases of horses |
| Hippology |
The study of horses |
| Histology |
Study of the tissues of organisms |
| Histopathology |
Study of changes in tissue due to disease |
| Historiography |
Study of writing history |
| Historiology |
Study of history |
| Homiletics |
The art of preaching |
| Hoplology |
The study of weapons |
| Horography |
Art of constructing sundials or clocks |
| Horology |
Science of time measurement |
| Horticulture |
Study of gardening |
| Hydrobiology |
Study of aquatic organisms |
| Hydrodynamics |
Study of movement in liquids |
| Hydrogeology |
Study of ground water |
| Hydrography |
Study of investigating bodies of water |
| Hydrokinetics |
Study of motion of fluids |
| Hydrology |
Study of water resources |
| Hydrometeorology |
Study of atmospheric moisture |
| Hydropathy |
Study of treating diseases with water |
| Hyetology |
Science of rainfall |
| Hygiastics |
Science of health and hygiene |
| Hygienics |
Study of sanitation; health |
| Hygiology |
Hygienics; study of cleanliness |
| Hygrology |
Study of humidity |
| Hygrometry |
Science of humidity |
| Hymnography |
Study of writing hymns |
| Hymnology |
Study of hymns |
| Hypnology |
Study of sleep; study of hypnosis |
| Hypsography |
Science of measuring heights |